100W Ultimate Fidelity Amplifier

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#4,925
You must add this circuit to AX14 output.
Or add this circuit and wiring as picture
 

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  • APEX AX14 wireing.jpg
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#4,928
AndrewT said:
fake 2n5401, or wrongly inserted 2n5401?
solving by replacing with a different pin out BC5xx suggests an assembly error![/ QUOTE]

as you can see in the picture of post 4892, 5401 are installed correctly.
I changed the signal cable and now things are better.
I will review the board with signal generator and oscilloscope because there oscillation.

thimios said:
2N 5401 is ebc when bc is cbe
2N are 150v devices when bc are 45v.[/ QUOTE]

I think to replace 2N5401( or BC in my case ) with MPSA92
Click to expand...
Click to expand...
 
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#4,929
Hi Olaf,

The A14 is singing. I had a little trouble at first until I noticed that the input ground is not attached to anything. I installed a 5R6 resistor from input ground to PGND and all is well. This is quite a nice amp. Square waves are very sharp and the sound is clear with strong bass. Very nice.
 

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#4,932
Join Date: Feb 2010
Exclamation please help!DC voltage in AV400 amp output
hello guys friends
my anthonyholton AV400 mosfet amp be fail due the DC voltage about 100Volt in output that burn my speaker
i have been replace all 8 mosfets but problem exists yet
please guide me that what is wrong?
if it cause belong to drivers transistor?
 
#4,933
still4given said:
Hi Olaf,

The A14 is singing. I had a little trouble at first until I noticed that the input ground is not attached to anything. I installed a 5R6 resistor from input ground to PGND and all is well. This is quite a nice amp. Square waves are very sharp and the sound is clear with strong bass. Very nice.
Click to expand...





Hi Terry, that looks really good.
Separation from SGND and PGND is in some Apex amplifiers. The wiring diagram looks like the AX14 (picture). The resistor is then unnecessary.

Regards Olaf
 

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  • APEX AX14 wireing.jpg
    APEX AX14 wireing.jpg
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#4,934
sasan2048 said:
Join Date: Feb 2010
Exclamation please help!DC voltage in AV400 amp output
hello guys friends
my anthonyholton AV400 mosfet amp be fail due the DC voltage about 100Volt in output that burn my speaker
i have been replace all 8 mosfets but problem exists yet
please guide me that what is wrong?
if it cause belong to drivers transistor?
Click to expand...
AV400 is not an Apex 100W Ultimate Fidelity Amplifier.

You are in the wrong Thread.
 
#4,935
AX14 with STD03 outputs
P-max : 75Wrms / 8R0 @ +/-55VDC
Ao : 28dB
BW (-1dB) : 2,2Hz - 255KHz
Phase : +2,5deg@20Hz
-3,5deg@20KHz
Input voltage noise dens. : 5,5nV/sqrt(Hz)
SN : 107dB
SR : 85V/usec
THD + N (1KHz) : 8,5 E-05 ili cca 0,0001%@1Wrms/8R0
0,002%@10Wrms/8R0
 

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  • AX14 - STD03.JPG
    AX14 - STD03.JPG
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#4,937
I spent few days to read all posts from this thread, i can say i learned a lot of thinks regarding this tipe of amp. Thank you very much Sir Mile for all information posted and explained here. After all this words with a lot of work behind i decided to start with Apex A40 in my spare time !

Thx again and wish to all more and more good results !

Regards

Marius UDR
 
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